Homework 4

javali_tests/HW4_nop90/Casts/ErrCastUnrelatedType.javali

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+// Test types in a Cast (cannot cast to unrelated type)
+
+class Main {
+	void main() {
+		C1 a, b;
+		C2 c, d;
+		Object o;
+		c = new C2();
+		a = new C1();
+		
+		b = (C1) c;
+		d = (C2) a;
+		o = (Object) a;
+		o = (Object) c;
+		o = (Main) c;
+	}
+}
+
+class C1 {}
+
+class C2 extends C1{}

javali_tests/HW4_nop90/Casts/ErrObjectToArrayCast.javali

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+// Test downcast from Object to array
+
+class Main {
+	void main() {
+		A[] a;
+		Object o;
+		
+		o = new Object();
+		
+		a = (A[]) o;
+	}
+}
+
+class A{}

javali_tests/HW4_nop90/Casts/ErrPrimitiveCast.javali

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+// Test types in a Cast 
+// cannot cast an int to an boolean
+
+class Main {
+	void main() {
+		int a;
+		boolean b;
+		a = 1;
+		
+		b = (boolean) a;
+	}
+}

javali_tests/HW4_nop90/Casts/ErrPrimitiveCast2.javali

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+// Test types in a Cast (cannot cast to unrelated type)
+
+class Main {
+	void main() {
+		int a;
+		boolean b;
+		//b = false;
+		
+		a = (int) b;
+	}
+}

javali_tests/HW4_nop90/Casts/OkArrayToObjectCast.javali

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+// Test downcast from array to Object
+
+class Main {
+	void main() {
+		int[] x;
+		Object o;
+		
+		x = new int[5];
+		
+		o = (Object) x;
+	}
+}

javali_tests/HW4_nop90/Casts/OkArrayToObjectCast2.javali

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+// Test downcast from array to Object
+
+class Main {
+	void main() {
+		A[] a;
+		Object o;
+		
+		a = new A[5];
+		
+		o = (Object) a;
+	}
+}
+
+class A{}

javali_tests/HW4_nop90/Casts/OkSubtype.javali

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+// Test cast from a type to the same type
+
+class Main {
+	void main() {
+		C c,d;
+		Object o,g;
+		c = new C();
+		g = new Object();
+		
+		d = (C) c;
+		o = (Object) g;
+	}
+}
+
+class C {}

javali_tests/HW4_nop90/Casts/OkTypeCast.javali

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+// Test valid casts
+
+class Main {
+	void main() {
+		C1 a, x;
+		C2 c,d;
+		C4 b,f;
+		Object o;
+		c = new C2();
+		a = new C1();
+		b = new C4();
+		f = new C4();
+		
+		x = (C1) b;
+		o = (Object) f;
+	}
+}
+
+class C1 {}
+
+class C2 extends C1{}
+
+class C3 extends C2{}
+
+class C4 extends C3{}
+

javali_tests/HW4_nop90/Casts/OkTypeToObjectCast.javali

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+// Test casts from type to object
+
+class Main {
+	void main() {
+		C1 a;
+		Object o,f,g;
+		int x;
+		boolean y;
+		a = new C1();
+		x = 2;
+		y = true;
+		
+
+		o = (Object) a;
+		//f = (Object) x;
+		//g = (Object) y;
+	}
+}
+
+class C1 {}
+
+
+